煤炭转化2025，Vol.48Issue(5)：40-50,11.DOI:10.19726/j.cnki.ebcc.202505004
壁面条件下氨熄灭极限与氮氧化物生成特性
Extinction limits and nitrogen oxides formation characteristics of ammonia-air flame at a plane wall
摘要
Abstract
Ammonia,as a zero-carbon fuel,can effectively reduce carbon emissions when used in combustion equipment.The interaction between gas-phase flames and walls in combustion equipment affects combustion stability and nitrogen oxide formation.The extinction limits and nitrogen oxide formation characteristics of ammonia/air premixed flames under adiabatic and wall conditions were compared through numerical simulation and the influence of wall temperature and preheating temperature on the extinction limits and nitrogen oxide formation characteristics of ammonia combustion were explored.The results indicate that the extinction limits of ammonia combustion under wall conditions are significantly lower than those under adiabatic conditions,and the maximum extinction limit corresponds to an equivalence ratio of 1.05.When the equivalence ratio is less than 1.0,more NO is produced when the unit mass of ammonia fuel is consumed under wall conditions than under adiabatic conditions.When the equivalence ratio exceeds 1.1,the trend is reversed.The wall temperature has little effect on the extinction limits and NO formation,whereas increasing the preheating temperature will significantly increase the extinction limits.By increasing the preheating temperature near the equivalence ratio of 1.0 under wall conditions,combustion stability can be improved while only introducing a certain amount of NO emissions.The research conclusion provides certain theoretical support for the application of ammonia in practical combustion equipment,which is helpful for the design of ammonia combustion systems and the optimization of combustion processes.关键词
氨燃料/滞止火焰/熄灭极限/氮氧化物/预热温度Key words
ammonia/stagnation flame/extinction limit/nitrogen oxides/preheating temperature分类
能源科技引用本文复制引用
沈文锋,周信凯,熊宇航,刘然..壁面条件下氨熄灭极限与氮氧化物生成特性[J].煤炭转化,2025,48(5):40-50,11.基金项目
国家自然科学基金项目(22303014)、福建省自然科学基金项目(2025J01873)和集美大学科研启动金项目(ZQ2020013). （22303014）
